The Facet Fuel-Gard monitor cartridges meet the latest edition of the Institute of Petroleum (I.P.) Specifications and Qualification Procedures-Aviation Fuel Filter Monitors with Absorbent Type Elements.The cartridge is made up of layered and pleated, multi-media sections with inner support shells and an outer wrap. A special water absorbent media retains water and the pleats expand. As the maximum water- holding capacity is reached, a reduction in flow occurs, indicating the cartridge should be changed. Maximum recommended operating temperature is 160°F at a maximum differential pressure of 180 psi.